IES Seminar Series - Professor Naoyuki Amemiya


Classroom 10, Alrick Building, King's Buildings


Friday, January 13, 2017 - 12:45 to 14:00

Understanding Electromagnetic Phenomena in High Tc Superconductors toward Their Attractive Applications



The advantages of superconductors are current transport with extremely low losses and high magnetic field generation in a large space, both of which are unavailable using copper. Because electromagnetic phenomena of superconductors often deteriorate these advantages, their understanding is a key issue for the attractive applications of high Tc superconductors.

Among various electromagnetic phenomena, I focus on shielding currents and ac losses in ReBCO coated superconductors, which are determined by the behaviors of fluxoids. The former directly deteriorate the first advantage of superconductors. The latter deteriorates the field quality of a magnet, which is essential for some applications.

In this seminar, at first, the principles of inducing shielding currents and generating ac losses are explained, together with their relevance for the attractive applications of superconductors. Next, I review the numerical modellings of ReBCO coated conductors with three-dimensional shape for electromagnetic field analyses, which are useful tools for understanding the electromagnetic behaviors in ReBCO coated conductors. Finally, some topics on the numerical and experimental studies on ac losses and the field qualities affected by shielding currents are presented.

This work is supported in part by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) through the Innovative Nuclear Research and Development Program.


Naoyuki Amemiya received his Dr. Eng. Degree from the University of Tokyo in 1990. He joined Yokohama National University in the same year (Lecturer in 1992; Associate Professor in 1993; Professor in 2005) and transferred to Kyoto University in 2008. He stayed at the National High Magnetic Field Laboratory in 1996 as a Visiting Scientist and at University of Twente from 2000 to 2001 as an Exchange Scientist between JSPS and NWO.

His research interests include electromagnetic phenomena of superconductors such as magnetizations, ac losses, stabilities etc. and magnet applications of superconductors. He is currently leading a collaborating team for an R&D project of fundamental technologies of HTS accelerator magnets funded by JST. One of its target applications is carbon cancer therapy. In 2016, he started the feasibility study of HTS accelerator magnets for accelerator-driven nuclear transmutation systems (ADS), which is useful for the treatment of nuclear waste, funded by MEXT.

He was the Board Member of ASC, Inc. from 2006 to 2016 and was the Program Chair of ASC 2016. He was the Asian Editor and Executive Board Member of Superconductor Science and Technology from 2009 to 2014. 

Seminar Info:

There will be host of hot beverages, sandwiches and cakes available from 12.45. Please see below for further details and we look forward to seeing you all there.

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Professor Naoyuki Amemiya, Kyoto University
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